rustpad

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🔪🏛️ A multi-threaded what now?

rustpad is a multi-threaded successor to the classic padbuster, written in Rust. It abuses a Padding Oracle vulnerability to decrypt any cypher text or encrypt arbitrary plain text without knowing the encryption key!

🦀💻 Features

• Decryption of cypher texts
• Encryption of arbitrary plain text
• Multi-threading on both block and byte level
• Modern, real-time and interactive TUI!
• No-TTY support, so you can just pipe output to a file
• Supports Web server oracles...
• ... and Script-based oracles. For when you need just that extra bit of control.
• Automated calibration of web oracle's (in)correct padding response
• Progress bar and automated retries
• Tab auto-completion
• Block-level caching
• Smart detection of cypher text encoding, supporting: hex, base64, base64url
• No IV support
• Written in purely safe Rust, making sure you don't encounter nasty crashes

🗒️🤔 Usage

Using rustpad to attack a padding oracle is easy. It requires only 4 pieces of information to start:

• type of oracle (web/script, see below)
• target oracle (--oracle)
• cypher text to decrypt (--decrypt)
• block size (--block-size)

Web mode

Web mode specifies that the oracle is located on the web. In other words, the oracle is a web server with a URL.

For a padding oracle attack to succeed, an oracle must say so if a cypher text with incorrect padding was provided. rustpad will analyse the oracle's responses and automatically calibrate itself to the oracle's behaviour.

; rustpad web --help
rustpad-web 1.8.0
Question a web-based oracle

USAGE:
    rustpad {web, --web, -W} [OPTIONS] --oracle <ORACLE_LOCATION> --block-size <BLOCK_SIZE> --decrypt <CYPHER_TEXT>

OPTIONS:
    -A, --user-agent <USER_AGENT>
            User-agent to identify with

            [default: rustpad/1.8.0]

    -B, --block-size <BLOCK_SIZE>
            Block size used by the cypher

            [options: 8, 16]

    -c, --consider-body
            Consider the response body and content length when determining the web oracle's response to (in)correct padding

    -d, --data <POST_DATA>
            Data to send in a POST request

    -D, --decrypt <CYPHER_TEXT>
            Original cypher text, received from the target service, which is to be decrypted

        --delay <THREAD_DELAY>
            Delay between requests within a thread, in milliseconds

            [default: 0]

    -e, --encoding <ENCODING>
            Specify encoding used by the oracle to encode the cypher text

            [options: auto, hex, base64, base64url]

            [default: auto]

    -E, --encrypt <PLAIN_TEXT>
            Plain text to encrypt. Note: encryption mode requires a cypher text to gather necessary data

    -h, --help
            Print help information

    -H, --header <HEADER>
            HTTP header to send

            [format: <name>:<value>]

    -k, --insecure
            Disable TLS certificate validation

    -K, --keyword <KEYWORD>
            Keyword indicating the location of the cypher text in the HTTP request. It is replaced by the cypher text's value at runtime

            [default: CTEXT]

    -n, --no-iv
            Cypher text does not include an Initialisation Vector

        --no-cache
            Disable reading and writing to the cache file

        --no-url-encode
            Disable URL encoding and decoding of cypher text

    -o, --output <LOG_FILE>
            File path to which log output will be written

    -O, --oracle <ORACLE_LOCATION>
            The oracle to question with forged cypher texts. This can be a URL or a shell script.

            See the subcommands `web --help` and `script --help` respectively for further help.

        --proxy-credentials <PROXY_CREDENTIALS>
            Credentials to authenticate against the proxy server with

            [format: <user>:<pass>]

    -r, --redirect
            Follow HTTP Redirects

    -t, --threads <THREAD_COUNT>
            Amount of threads in the thread pool

            [default: 64]

    -T, --timeout <REQUEST_TIMEOUT>
            Web request timeout in seconds

            [default: 10]

    -v, --verbose
            Increase verbosity of logging

    -V, --version
            Print version information

    -x, --proxy <PROXY_URL>
            Proxy server to send web requests over. Supports HTTP(S) and SOCKS5

Indicate the cypher text's location! See `--keyword` for clarification.

Script mode

Script mode was made for power users ~~or CTF players 🏴‍☠️ who were given a script to run~~. The target oracle is a local shell script.

Scripts allow you to run attacks against local oracles or more exotic services. Or you can use script mode to customise and extend rustpad's features. However, if you're missing a feature, feel free to open an issue on GitHub!

; rustpad script --help
rustpad-script 1.8.0
Question a script-based oracle

USAGE:
    rustpad {script, --script, -S} [OPTIONS] --oracle <ORACLE_LOCATION> --block-size <BLOCK_SIZE> --decrypt <CYPHER_TEXT>

OPTIONS:
    -B, --block-size <BLOCK_SIZE>
            Block size used by the cypher

            [options: 8, 16]

    -D, --decrypt <CYPHER_TEXT>
            Original cypher text, received from the target service, which is to be decrypted

        --delay <THREAD_DELAY>
            Delay between requests within a thread, in milliseconds

            [default: 0]

    -e, --encoding <ENCODING>
            Specify encoding used by the oracle to encode the cypher text

            [options: auto, hex, base64, base64url]

            [default: auto]

    -E, --encrypt <PLAIN_TEXT>
            Plain text to encrypt. Note: encryption mode requires a cypher text to gather necessary data

    -h, --help
            Print help information

    -n, --no-iv
            Cypher text does not include an Initialisation Vector

        --no-cache
            Disable reading and writing to the cache file

        --no-url-encode
            Disable URL encoding and decoding of cypher text

    -o, --output <LOG_FILE>
            File path to which log output will be written

    -O, --oracle <ORACLE_LOCATION>
            The oracle to question with forged cypher texts. This can be a URL or a shell script.

            See the subcommands `web --help` and `script --help` respectively for further help.

    -t, --threads <THREAD_COUNT>
            Amount of threads in the thread pool

            [default: 64]

    -v, --verbose
            Increase verbosity of logging

    -V, --version
            Print version information

Script must respond with exit code 0 for correct padding, and any other code otherwise. Cypher text is
passed as the 1st argument.

Shell auto-completion

rustpad can generate tab auto-completion scripts for most popular shells:

rustpad setup <shell>

Consult your shell's documentation on what to do with the generated script.

🕥💤 Coming soon

• [ ] smarter URL parsing
• [ ] advanced calibration: response text should contain "x", time-based
• [ ] automated block size detection
• [ ] improve linux binary's file size
• [ ] .NET URL token encoding?